Concrete



COATING R PLASTIC.

UNITED STATES PATENT OFFICE.

LEONARD n. mum, or ennnnwrcn, comrnc'rroum.

CONCRETE 1,369,794. Specification of Letters Patent. P t t d Man 1, 1 21 No Drawing. Application filed September 30, 1918. Serial No. 256,216.

To all whom it may concern: rough surface for attachment to the matrix Be it known that I, LEONARD H. Dyna, a through natural rusting or they may be arcitizen of the United States, residing in the tificially roughened by either roughening town of Greenwich, county of F airfield, and the sheet metal before it is formed into the State of Connecticut, have invented certain bodies or the bodies may be rou hened after new and useful Improvements in Concrete, they are completed. If desired the bodies of which the following is a specification. may be coatgd XTVl Qh an enamel to give a My invention relates to improvements in smooth sur ace or a ac imen o the maconcrete and the principal object I have in trix, tthus imitating the action of gravel aggrega e.

10 View is to lighten the weight of the finished The new aggregate of proper size is adaptproduct.

I attain this object by means of an 1med to be combined with a matrix f sand cemen an ter and mixed and molded proved aggregate.

he aggre ate, according to my invention, or 0 ierwise emp oyed as is customary with concrete using existing aggregates.

is hollow. t may be made of any shape,

If desired, the new aggregate can be comand of any suitable size. By making it hollow the usual weight of crushed stone or bined with aggregate composed of crushed stone or gravel, if it should be desired to gravel ordinarily utilized for the aggregate is reduced and a much lighter finished prodsave cost at the expense of light weight.

Having now described my invention, what uct issecured with equal strength.

My improved aggregate is formed of hol- I claim as new, and desire to secure by Let ters Patent, is

low metal bodies. These bodies may be of 1. Concrete, having the aggregate comcafi metal such as iron. but they are preferably made of shee't metal such as iron or posed of hollow metal bodles with thin steel Any,shape may be chosen, asnperiwalls.

cal oblate ,c lindricalcubical or irre u a 2. Concrete, having the aggregate com- Tliey may be all of the same size and shape posed of hollow sheet metal bodies.

or may be of different siz s and sha chosen for difierent uses or ail combined in 3. Concrete, having the a gregate composed of hollow sheet metal bodies exterithe same structure. If the bodies .are made orly coated.

of sheet metal they may be each made of a A. Concrete, the combination with the single piece suitably stamped or swaged matrix, of an aggregate embedded in said to shape, or they may be made of several matrix, said aggregate being formed of holparts, two for example, like a sheet metal low sheet iron bodies, stamped or swaged box with a telescopic cover. The sheet metal to sha may be made very thin, but enough strength 5. Concrete having aggregate elements being required to pret ent crushing or discomposed of hollow metal bodies with thin tortion. Preferably they should be more or walls. less water tight, otherwise they will fill with This specification si ed and witnessed the matrix and the desired light weight unthis 26th day of Septem er, 1918.

attain LEONARD H. DYER.

These bodies if made of sheet iron or steel ma be used with the usual matrix of In presence ofsfindw without furt er treatment, W. DOYLE,

e surface of each body forming a naturally JOSEPHINE D. Drnn. 

